Bosch Rexroth | H-4WEH25GB6X6EW110N9DAL
H-4WEH25GB6X/6EW110N9DAL
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The H-4WEH25GB6X/6EW110N9DAL directional valve belongs to the WEH Directional Spool Valves series from Bosch Rexroth. Installed in hydraulic automation circuits, it directs flow between pressure and service lines when electrical pilot signals actuate the main stage. Electro-hydraulic actuation lets a solenoid pilot shift the spool without large control forces, so the valve can handle a maximum flow of 400 l/min in symbol G circuits. The G-coded control spool establishes a metering profile suited to general-purpose distribution, and three spool positions provide a spring-centered neutral plus two work directions. A nominal size of NG25 matches systems built around 1-inch subplates, while a maximum operating pressure of 350 bar permits use in high-pressure mobile or industrial presses. The integrated 6E high-power pilot valve shortens response time, and the pilot connections are arranged on actuating side b to fit manifolds that reference that port orientation.
For electrical control, the pilot coil is rated at 110 V AC, allowing direct connection to common plant power without a separate DC supply. The pilot stage accepts pressures up to 250 bar, yet reliable shifting begins once 13 bar is available, a range compatible with low-pressure auxiliary circuits. System cleanliness must reach ISO 4406 class 20/18/15 so the spool and seats remain free of abrasive particles. During maintenance, a concealed N9 manual override lets technicians position the spool without energizing the coil. The valve mounts on the ISO 4401-08-08-0-05 interface, secured by six M12 × 60 bolts, and each screw needs 100 Nm of tightening torque to seal the porting plate against leakage. Combined, these mechanical details simplify installation while preserving functional integrity under cyclic service.
Technical Specifications
Actuating Side
b
Coil Voltage
110 V AC
Control Spool Symbol
G
Fluid Cleanliness
ISO 4406 20/18/15
Manual Override
Concealed (N9)
Max Flow (symbol G)
400 l/min
Max Operating Pressure (p, A, B)
350 bar
Max Pilot Pressure
250 bar
Min Pilot Pressure (3-pos Spring-centered)
13 bar
Mounting Interface
ISO 4401-08-08-0-05
Mounting Screws
6x M12 x 60
Nominal Size
NG25
Pilot Valve Option
6E (High-Power)
Spool Positions
3
Tightening Torque (m12)
100 Nm
Type Of Actuation
Electro-Hydraulic
1620 Old Apex Road
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